Thomas Reid, philosopher - From the Abstraction category:
-18th century... The painter hath occasion for an abstraction, with regard to visible objects... and this is indeed the most difficult part of his art. For it is evident, that if he could fix in his imagination the visible appearance of objects, without confounding it with the things signified by that appearance, it would be as easy for him to paint from the life, and to give every figure its proper shading and relief, and its perspective proportions, as it is to paint from a copy. (Thomas Reid, philosopher)
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